ExHale - Homegrown CO2 for your indoor plants FOR THE GROW TENT - Designed for small to medium sized grow spaces. The original will provide a 128 cubic foot space with CO2 for 6 months guaranteed. READY TO USE - ExHale comes complete and is cultivating CO2 even before you get out of the checkout line. Simply place ExHale in your grow space and leave it alone to do its job. EFFECTIVE CO2 DELIVERY - A continuous shower of CO2 from the ExHale bag directly onto your plants is the most efficient way to deliver CO2. PASSIONATE - ExHale came out of a true love of agriculture and out of the need for a less expensive, easier, safer and more harmonious way to provide your plants with CO2. INNOVATIVE - At the heart of every ExHale CO2 bag is the award winning mycelium-based strain which produces CO2 and promotes healthy plant growth.